Data Sheet
June 2002
TMXF28155 Supermapper
155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
17 TMUX Functional Description (continued)
■ The pointer interpreter transitions into the LOP state based on the following conditions:
— Continuous NDF. If NDF (1001, 0001, 1101, 1011, and 1000) is received in 8, 9, or 10 consecutive frames, as
determined by the value in TMUX_CTDLOPCNT[1:0] (Table 108 on page 100), then LOP will be declared.
— Invalid pointer values. If 8, 9, or 10 consecutive frames (determined by TMUX_CTDLOPCNT[1:0]) are received
with a pointer that is not a normal value, NDF, AIS, increment, or decrement, then LOP will be declared.
■ The pointer interpreter will transition out of the LOP state based on the following conditions:
— Following three consecutive frames with all ones in the H1 and H2 bytes, the pointer interpreter will transition
from the LOP state into the AIS state.
— Following three new, consecutive, consistent, and valid pointers, the pointer interpreter will transition from the
LOP state into the NORM state.
— The pointer interpreter will not transition from the LOP state into the NDF state.
■ The pointer interpreter will transition into the AIS state based on the following conditions:
— Following three consecutive frames with all ones in the H1 and H2 bytes, AIS will be declared.
■ The pointer interpreter will transition out of the AIS state based on the following conditions:
— Following three new, consecutive, consistent, and valid pointers, the pointer interpreter will transition from the
AIS state into the NORM state.
— Following eight consecutive invalid pointers, the pointer interpreter will transition from the AIS state into the
LOP state.
— If NDF is enabled on the incoming H1 and H2 bytes, the pointer interpreter will transition from the AIS state
into the NDF state.
■ The pointer interpreter will transition into the NDF state based on the following condition:
— If NDF is enabled on the incoming H1 and H2 bytes, the pointer interpreter will transition from the NORM,
NDF, AIS, INC, and DEC states into the NDF state.
■ The pointer interpreter will transition out of the NDF state based on the following conditions:
— Continuous NDF. If NDF (1001, 0001, 1101, 1011, and 1000) is received for eight consecutive frames, the
pointer interpreter will transition from the NDF state into the LOP state.
— Following any three consecutive, consistent, and valid pointers, the pointer interpreter will transition from the
NDF state into the NORM state.
— Following three consecutive frames with all ones in the H1 and H2 bytes, the pointer interpreter will transition
from the NDF state into the AIS state.
— Following three new, consecutive, consistent, and valid pointers, the pointer interpreter will transition from the
NDF state into the NORM state.
— Following eight consecutive invalid pointers, the pointer interpreter will transition from the NDF state into the
LOP state.
■ The pointer interpreter will transition into the NORM state based on the following conditions:
— Following three new, consecutive, consistent, and valid pointers, the pointer interpreter will transition into the
NORM state.
— Following any three consecutive, consistent, and valid pointers, the pointer interpreter will transition into the
NORM state, i.e., transitioning from the INC, DEC, and NDF states.
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